Utilizing Virtual File Systems (vsi) to extract the .kml from the .zip file

This function returns the '.kml' and '.kmz' files in form of virtual file paths. Moreover, the user has the option to download these files.

vsi_kml_from_zip(
  icesat_rgt_url,
  download_zip = FALSE,
  download_method = "curl",
  verbose = FALSE
)

Arguments

icesat_rgt_url

a character string specifying the input .zip URL

download_zip

a boolean. If TRUE the .zip file will be first downloaded and then the .kml files will be returned, otherwise the 'gdalinfo' function will be used as input to the R 'system2()' function to read the .kml files without downloading the .zip file. The 'gdalinfo' command requires that the user has configured GDAL properly.

download_method

a character string specifying the download method. Corresponds to the 'method' parameter of the 'utils::download.file()' function. Can be one of 'internal', 'wininet' (Windows only), 'libcurl', 'wget', 'curl' or 'auto'

verbose

a boolean. If TRUE then information will be printed out in the console

Value

an one column data.table of the output files

References

https://icesat-2.gsfc.nasa.gov/science/specs

https://gdal.org/user/virtual_file_systems.html

Examples

if (FALSE) {

require(IceSat2R)

URL = 'https://icesat-2.gsfc.nasa.gov/sites/default/files/page_files/arcticallorbits.zip'

#..................................
# without downloading the .zip file
#..................................

res_out = vsi_kml_from_zip(icesat_rgt_url = URL,
                           download_zip = FALSE,
                           download_method = 'curl',
                           verbose = TRUE)
str(res_out)


#.............................
# by downloading the .zip file
#.............................

res_out = vsi_kml_from_zip(icesat_rgt_url = URL,
                           download_zip = TRUE,
                           download_method = 'curl',
                           verbose = TRUE)
str(res_out)

}